Furnace



(No Model.) 3 Sheets-Sheet 1.

0. F. MILLER. FURNAGB.

No. 432,542. Patent July 22, 1890.

WITNESSES INVEJVTOJ;

C/zarZwEfifi/Zkz MW Attorney (No Model.) 3 Sheets-Sheet 2.

C. F. MILLER. FURNACE.

No. 432,542. Patented July 22, 1890.

WITNESSES I JV VEJV T 018 m: mums versus 1:0,. mom-mum, WASKINGTON, o. c

(No Model!) 3 Sheets-Sheet 3. O. P. MILLER.

FURNACE.

Patented July 22, 1890.

OOOOOOOOOOQ U- D i INT ENTOR Gimmes FJZLZZW .Attorney UNITED STATESPATENT OFFICE.

CHARLES F. MILLER, OF LANCASTER, PENNSYLVANIA'ASSIGNOR OF FIVE-EIGHTI'IS TO BERNARD .I. MCGRAUN, OF SAME PLACE, AND A. J. DULL, OF

HARRISBURG, PENNSYLVANIA.

FURNACE.

SPECIFICATION forming part Of Letters Patent No. 432,542, dated July 22,1890.

Application filed April 18, 1890. Serial No. 348,548. (No model.)

To all whom, it may concern:

Be it known that 1, CHARLES F. MILLER, a' citizen of the United States,residing at Lancaster, in the county of Lancaster and State ofPennsylvania, have invented certain new and useful Improvements inFurnaces; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention is an improvement on Patent No. 418,955, granted to meJanuary 7, 1890. The chief advantages of said improvement over saidpatent are that the pipes conveying the superheated steam are all.within the furnace; that this steam is applied more effectively forcausing the inflow of air; that the same superheated-steam pipe is madeto supply a steam-jet under the boiler and another, as a steam-blower,into the air-tubes; that these tubes have a simpler and moresatisfactory construction than in said patent, and that various otherdetails of the furnace have been made more effective, all these endsbeing attained by the construction and combination ofdevices hereinaftermore particularly set forth and claimed.

In the accompanying drawings, Figure 1 represents a vertical centrallongitudinal section of a furnace embodying my invention. Fig. 2represents a vertical cross-section of the same on the line 0: no ofFig. 1.

resents a horizontal longitudinal section of the same on the line y y ofFigs. 1 and 2. Fig. 4 represents a rear end elevation of the same. Figs.5, 6, and 7 represent detail views of the blower.

A designates the masonry of the furnace and boiler setting; 13, thecombustion-chamber; C, the grate; D, the ash-pit; E, the firebridge; F,the boiler, which is horizontal, having longitudinal hot-air tubes f; G,the passage leading from the combustion-chamber a, 5 v to one end ofsaid tubes, and H the corresponding passage above said boiler leadingfrom the other end of said tubes to the chimney- .flue I. In these partsas thus far enumerated there is nothing new.

Fig. 3 rep- From the steam-dome F of the boiler a pipe J, controlled bya globe-valvej, extends to a superheating-coil K, arranged in the flueI. Thence the superheated steam passes down by a pipe 70 to a secondsuperheatingcoil K in a space G, which is an expansion 5 5 of passage G,the said second coil being in tensely heated by the products ofcombustion before these enter the hotair tubes f of the boiler. Thence apipe 70 extends downward a short distance to a horizontal pipe L,whichextends forward as far as the fire-bridge and rearward out through theend wall of the furnace. The forward end of this pipe is provided with ablast-nozzle M for discharging the excessively superheated steam againstthe under side of the boiler. The other end of said pipe L is bentaround outside of the furnace-wall and returned to the same for creatinga powerful air-feed. To effect this the said pipe is at this pointconnected to a blower N, consisting of a pipe or hollow casting havingthe formof a rectangle. This pipe or casting is perforated with a numberof outlets a, each being spiral in form to secure a better admixture ofthe air and steam as the latter rushes violently out of said blower. Thedischarge is directly into a doubly-flared blower-casing O, the innerend of which receives the tapering outer ends of several air-inlet pipesP. These diverge and So continually increase in diameter until theyreach the fire-bridge E. They then taper in the other direction andincline downward, as indicated at P, to avoid the grate 0. They finallydischarge into the ash-pit D. The re- 8 5 peated superheating of thesteam on its way to the blowerinsures a prodigious blast, if theair-inlet be left fully open and the flow of steam unchecked; but I haveboth of these elements under command. A slide R, movo able across themouth of the blower-casing, cuts off at will more or less of the supplyof air, while a valve S in the steam-pipe L is operated by anangle-lever T to cut oif the steam partly or wholly, as desired. Forcon- 5 venience of manipulation a long rod or handle T extends from saidlever to the front of the furnace.

Ilaving thus described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is

1. In combination with a furnace and boiler, a steam-pipe leading fromthe latter and formed in coils, one above the boiler to be acted on bythe heat after it. has passed through the boiler, and the other below itand being heated by the hot air before it onters said boiler, and twodischarge-openings for said superheated steam, one under the boiler andthe other into an air-flue which discharges under the grate,substantially as set forth.

2. In combination with a furnace and boiler, a steam-pipe leading fromthe latter and formed in coils, one above the boiler to be acted upon bythe heat after it has passed through the boiler, and the other below itand being heated by the hot air before it passes through the boiler, avalve controlling the flow of steam into said coils, twodischarge-openings for said superheated steam, one under the boiler, theother into an airflue which discharges under the grate, and two Valveswhich control the flow of steam both into the air-line and againsttheboiler.

&

tending from the latter, an air-inlet pipe discharging under saidcomhust ion-chain bcr and a perforated pipe or easing discharging steaminto said air-inlet pipe, the stcanrsupply being derived from said superheatin g steam-pipe, and both the air-inlet and steam pipe beingprovided with valves for eontrol ling the supply of air and steam,substantially as set forth.

I. A steam-blower, in combination with a group of several air-teed pipesor air-inlet pipes, all of which taper and incline together, ending inthe l. lower-casing, the combustionehamber supplied by said pipes, thesteamboiler, and connections between said boiler and blower,substantially as set forth.

5. A series of. air-feed pipes, all converging into a common air-inletopening, in combination with a steam-blowerdischarging into said inlet,a boiler, and a superheating-pipe supplying said blower, and acombustion-chamber supplied by said air-feed pipes and heating saidboiler, substantially as set forth.

In testimony whereof I atlix my signature in presence of two witnesses.

CHARLES 1 MILLER.

\Vitnesses:

1.). MILEs SHERTZ, Jason IIAL'BACH.

